Lamp structure



Oct. 6, 1942.

J. A. KORENGOLD LAMP STRUCTURE 3 Sheets- Sheet 1 Filed June 24, 1940 INVENTOR 1942- J. A. KORENGOLD 2,297,781

LAMP STRUCTURE Filed June 24, 1940 5 Sheets-Sheet 2 I 12 W L /f INVENTOR. I J JOHN A.KoRE soLo v ATTORNEY V Oct. 1942. J. A. KORENGOLD LAMP STRUCTURE Filed June 24, 1940 a Sheets-Sheet a Fl G .7.

INVENTOR.

JOHN A. KORENGOLD ATTORNEY.

Patented Oct. 6, 1942 UNITED STATES I PATENT OFFICE John A. Korengoid, Chicago, Ill. Application June 24, 19, Serial No. 342,086 4 Claims. (Cl. Mil-41.15)

This invention relates to certain new and useful improvements in lamp structures or so-called illuminators particularly adapted for use in dental and surgical operating rooms.

My invention has for its primary objects the provision of a lamp structure or illuminator which will afford in a single unitary structure all of the necessary types of illumination required in a dental or surgical operating room, which is ringed and durable in structure, which is attractive in appearance, which is economical in cost of construction and maintenance, and which is readily manipulable by the dentist, surgeon, or operator with a minimum of manual eiiort.

My invention has for a further object the provision of an illuminator for dental and surgical operations, which may be readily adjusted for projecting its beam at any desired angle or in any selected direction, which may be varied in intensity, which produces a minimum of heat, which produces a beam of substantially rectangular cross-section and uniform intensity, and which is highly eilicient in the performance of its stated functions.

And with the above and other objects in view, my invention resides in the novel features of form, construction, arrangement, and combination of parts presently described and pointed out in the claims.

In the accompanying drawings (3 sheets)- Figure 1 is a reduced perspective view of a lamp structure or illuminator constructed in ac cordance with and embodying my present invention;

Figure 2 is a side elevational view, partly broken away and in section, of the illuminator;

Figure 3 is an enlarged transverse sectional view of the illuminator taken approximately along the line 3-3, Figure 2;

.Figure 4 is an enlarged longitudinal sectional view of the indirect room-illuminating member of the lamp structure taken approximately on the line 4-4, Figure 1;

Figure 5 is a vertical sectional view of the illuminating member taken approximately along the line II,1"i811re 1;

Figure 6 is a horizontal sectional view of the illuminating member taken approximately along I the line 8-4, Figure 5; and v Figure 7 is a fragmentary vertical sectional view of the head tilting mechanism taken approximately along the line 1-4, Figure 5.

Referring now in more detail and by reference characters to the drawings. which illustrate a a pair of opposed radial ears 3 for accommodating a clamping screw 4. .The sleeve 2 is adapted to fit upon a suitable preferably tubular bracket B bolted or otherwise suitably secured to a wall or the like, as best seen in Figure 1; however, it will be understood that the sleeve 2 may, with equal facility, be fitted directly upon any suitable supporting member, such, for instance, as any available dental unit or other type of surgical or dental equipment.

Journaled upon the upper end of, and extending radially outwardly from, the post I, is a tubular swingable arm I provided at its outer end with an upwardly presented socket 8 for receiving the lower end of a pivot sleeve I rotatably disposed at its upper end in the downwardly presented socket-end 8 of a second horizontally disposed swingable tubular arm 9, in turn, provided at its outer end with an upwardly presented ex- I tension ill having an upwardly presented socket it, all as best seen in Figure 2 and for purposes presently appearing.

Mounted in the upper end of the post i an projecting upwardly beyond the arm 5, is a twopronged connector-element i2 adapted for engagement in a co-operable connector-element l2 fixed in the post i. At its upper end, the element I2 is provided with a diametrally'enlarged barrel l3 resting endwise upon the upper margin of the post i and, in turn, provided with a decorative outer casing I 4 apertured, as at i5, for accommodating an operating key It and diametrally sized for snugly embracing the downwardly projecting neck ll of a bowl-shaped in- 7 direct lighting fixture l8.

In its upper end, the barrel I3 is finally provided with a conventional screw-receptacle IQ for receiving a conventional electric light bulb b, all as best seen in Figure 4.

Embracingly mounted on, and positioned preferably centrally of, the arm 9, is a U-shaped bracket 20 having its bight 20' disposed beneath the arm 0 and provided with a downwardly projecting axially bored stud 2| having a ballshaped end portion 22 for pivotal engagement in a universal joint housing 23, in turn, at its other end adapted for receiving the ball-end portion 24 of an axially bored .stud 25 supportingly mounted in the upper face of an elongated downwardly opening reflector housing 26 provided with a transformer 21, a manually operpreferred embodiment of my invention, the lamp able switch 28, opposed sockets 29, and a fluorescent tube 30, all as best seen in Figures 1 and 3 and for purposes presently fully appearing.

Swingably mounted in the upwardly presented socket ll of the arm-extension I0, is a diametrally reduced Journal end 3! of an L-shaped housing or shell 32, which preferably integrally includes vertically disposed side walls 33, a bottom wall 34, and a rear wall 35. The housin or shell 32 is open at its forwardly presented end and is provided with opposed parallel arcuately shaped side wall continuations 36. Formed preferably integrally with the bottom and rear walls 34, 35, respectively, are forwardly projecting aligned bosses 3i, 38, provided with registering apertures 39, 40, for rotatively receiving a horizontally disposed. shaft 4i provided at its outwardly projecting end with a manipulating handle 42 and at its inner projecting end with a worm gear 48 for meshing engagement with a pinion M keyed centrally upon a short shaft c5 rotatably mounted in, and projecting horizontally through, the side-wall continuations 36.

Keyed upon the outerprojecting end of the shaft 45 for facewise abutting engagement upon the outer faces of the side wall continuations 36 and secured in place by means of lock nuts 66, are bracket members 4'? provided with op= positely presented bent-over flanges it for riveted securement to a bowl-shaped'illuminator shell or housing 39 preferably formed of molded plastic or other suitable material and including parabolic side segments 55, flattened top and bottom segments 59, flange or bell b2, and a transverse rear wall 53 provided with a rearwardly projecting peripheral flange 54 and a central aperture 55 having diametrally opposed elongated slots 55. Formed preferably integrally upon the inner face of the shell 49 and extending inwardly from the forward margin across the upper and lower flattened sections of the flange 52, are pairs of symmetrically positioned bosses 51 each having a set-back front face 58 and a longitudinally extending channel 59, the shell-flange 52 being flnally provided, between the paired bosses 51, with step-like ventilating louvres 50, all as best seen in Figures 5 and 6 and for purposes presently fully appearing.

Secured, as by means of screws or other suitable fastening means, upon the forwardly presented face of the rear shell wall 53 concentrically with the. apertur 55, is a centrally apertured base plate 6| provided with a pair of forwardly projecting legs Bi axially bored and tapped for receiving mounting screws 82 extending securingly through a conventional'electrio socket 83 having a forwardly presented receptacle 84 for receiving a suitable electric light bulb b.

Rotatably mounted in and extending through the central aperture of the plate 8| and secured by means of a tensioning spring 55 and lock nut 66, is a rearwardly extending lead screw 61 preferably integrally provided at its outer end with a concentric cup-like manipulating shell 83 having a forwardly extending side wall 58 disposed at its forward peripheral margin in rotatable endwise abutment against the rearwardly presented face of the rear wall flange a forwardly projecting the outer face of the rear wall flange 54, all as best seen in Figures 5 and 6.

Marginally secured to the shell-49, is a preferably parabolic reflector l2 spun or otherwise suitably formed from aluminum, brass. or the like and provided upon its forwardly presented reflecting face with any selected surface coating commonly used in reflectors. Adjacent its forward peripheral margin, the reflector 12 is cut away along a somewhat hyperbolic curve, as at c, in the provision of two diametrally opposed U-shaped recesses 13 disposed symmetricallywith respect to the vertical axial plane of the reflector l2 and substantially embracing the pairs of bosses 51.

The reflector 12 is also provided with a centrally disposed rearwardiy opening aperture 14 and a preferably integral rearwardly projecting annular flange or collar 15 of substantially greater diametrai size than the largest diametral size of the lamp b, for shiftably supporting an open-ended tubular light control sleeve 15 having two diametrally opposed U-shaped recesses Ti extending axiallyinwardly from its forward peripheral margin and disposed approximately at an angle of 90 with respect to the reflector recesses I3.

At its rear end and outwardly of the reflector collar 15, thesleeve It is riveted or otherwise securely fastened at diametrally opposed points to forwardly projecting horizontally disposed members 18 extending shiftably through the rear wall slots 56 and transversely connected by a bight member 19 in the formation of a supporting clevis 80. Rotatably mounted in the clevisbight i9, is a centrally disposed nut 8| for threaded engagement with the lead screw 51, all as best seen in Figures 5 and 6 and for purposes presently more fully appearing.

Secured upon forward faces of, and extending longitudinally between, the opposed bosses 51, are inwardly opening channel members 82 each preferably provided with an integral masking segment 88. Supported along their forward margins in the channels 82 and edgewise engaged in the boss-channels 59, are paired arcuate segments 84, 84', respectively formed of light correction and heat absorbing glass extending axially into, and marginally contouredfor fitting snugly against the forward face of, the reflector I2.

, Similarly secured upon the shell rim between one of the sets of paired bosses 51, is a conventional hinge member 85 welded or otherwise marginally fixed upon a central metallic panel 86 covering the area between, and marginally overlapping, the channel members 82 for permitting access to the bulb b. Removably secured by means of screws to the arcuate side portions of the flange periphery between the ends of the channel members 82, are C-shaped framemembers 81 provided with inwardly presented marginal flanges 81' for retentive engagement with translucent lens segments 88 abutting against the boss faces 58, having their outer faces disposed in the peripheral plane of the shell flange 52 and flush with the outer faces of the channel members 82, and being formed preferably of frosted, etched, or patterned glass, all as best seen in Figures 5 and 6.

The socket 63, fluorescent lamp transformer 21, and the indirect fighting fixture socket I3 are all connected in parallel by means of a flexible electrical conduit 89 to a suitable source Thus, when of electric current (not shown).

the electric conduit is connected and the lamp structure or illuminator properly installed, the hand switch [6 may be turned to energize the light bulb b for casting an indirect light throughout the entire room. The fluorescent light 30 may be energized by manipulation of the switch 28 and may be swung around in any direction to bring a daylight simulating illumination upon any desired object. Thus, for instance, if the dentist is matching colors in teeth or porcelain filling materials, he may tilt the fluorescent lamp 30 in any direction so as to obtain a type of illumination in which color matching and similar operations may be very accurately and precisely performed. The operating light proper will, by reason of the shape of the reflector, togather with the light masking sleeve 16 and its apertures 11,.and also the opaque panel 86, produce a highly uniform and concentrated beam confined to an oblong rectangular area uniquely adapted for illuminating cavities of the human body, such as the mouth and the like. Theintensity of the light may be very minutely controlled and varied by rotating the shell 68, causing the light controlling tube 15 to move inwardly or outwardly, as the case may be, and as the tube '56 moves forwardly, the intensity of the light is out down and, conversely, as the tube 16 moves rearwardly, the intensity of the light is increased.

The illuminator may be conveniently installed and substantially meets all illuminating requirements of the selected location. The light fulfills in every respect the objects stated and it should be understood that changes and modifications in the form, construction, arrangement, and combination of the several parts of the illuminator may be made and substituted for those herein shown and described without departing from the nature and principle of my invention.

Having thus described my invention, what I claim and desire to secure by Letters Patent is:

1. A lamp-structure including, in combination, a bowl-shaped shell, a light-source flxed centrally within the shell, a. central opaque panel extending forwardly of the light-source diametrically across the mouth of, and having connec tion at its ends with, the shell, lens-means disposed in the mouth of the shell for projecting light-rays therefrom upon opposite sides of said panel, a centrally apertured parabolic reflector disposed about said light-source in, and flxed to, the shell, an opaque tubular light-control sleeve mounted for shiftable movement in the aperture of the reflector and about the light-source, segmental glass-sections disposed within the shell intermediate the light-source and reflector, and means for shifting said light-control sleeve relatively to the light-source.

2. A lamp-structure including, in combination,

a bowl-shaped shell having a transversely disposed centrally apertured rear wall, an electric socket having a base fixed upon said wall and projecting forwardly into the shell, 8. light-source seated in the socket, a central opaque panel extending forwardly of the light-source diametrically across the mouth of, and having connection at its ends with, the shell, lens-means disposed in the mouth of the shell for projecting therefrom light-rays upon opposite sides of the panel, a centrally apertured parabolic reflector disposed about said light-source in, and at its outer peripheral margin fixed to, the shell, the reflector having a centrally disposed peripherally flanged opening, an opaque tubular light-control sleeve mounted for movement longitudinally through said opening in the reflector and about the light-source, and means for shifting said sleeve relatively to the light-source, said means comprising a lead-screw mounted for rotation in the base of said socket and projecting through the aperture of the shell rear wall, a nut having threaded engagement with said lead-screw, and an extension on the sleeve projecting through the shell rear wall aperture and having fixed connection with said nut.

3. A lamp-structure including, in combination, a bowl-shaped shell having a transversely disposed centrally apertured rear wall, an electric socket having a base flxed upon said wall and projecting forwardly into the shell, a light-source seated in the socket, a central opaque panel ex tending forwardly of the light-source diametrically across the mouth of, and having connection at its ends with, the shell, lens-means disposed in the mouth of the shell for projecting therefrom light-rays upon opposite sides of the panel, a centrally apertured parabolic reflector disposed about said light-source in, and at its outer peripheral margin fixed to, the shell, the reflector having a centrally disposed opening, an opaque tubular light-control sleeve mounted for movement longitudinally through said opening in the reflector and about the light-source, segmental glass-sections disposed within the shell intermediate the light-source and reflector, and means for shifting said sleeve relatively to the light-source, said means comprising a lead-screw mounted for rotation in the socket base and projecting through the aperture of the shell rear wall, a nut having threaded engagement with said lead-screw, an extension on the sleeve projecting through the shell rear wall aperture and having fixed connection with said nut, and a manipulating member flxed to the screw and marginally rotatable upon the shell, said sleeve having diametrically opposite marginal recesses opening upon its forward end.

4. A lamp structure including an open-mouthed bowl-shaped outer housing provided with a central opaque panel extending across its mouth from top to bottom, segmentally shaped transparent lens members mounted on opposite sides of the panel, said opaque panel and said lens members together forming a closure for the housing, a reflector within the housing, a light source within the reflector, an axially shiftable openended tube disposed around the light source and having diametrally disposed lateral recesses extending inwardly from the margin of the open end of the tube and extending above and below the longitudinal axis of the reflector, and means for moving said tube toward and away from the opaque panel to control the amount of light directed toward the reflector.

JOHN A. KORENGOLD. 

